Microwave Dielectric Properties Measurements Using the Waveguide Reflection Dielectric Resonator

Measurements of dielectric properties of the homogeneous and isotropic medium in the microwave frequencies by a waveguide reflection dielectric resonator are studied. A dielectric rod sample is put inside of a rectangular cavity made by a microwave waveguide. The sample´s dielectric constant and loss tangent are measured at the resonant frequency of the TE_01delta mode. A simple field model of the waveguide reflection resonator is developed for the measurements of dielectric properties. This field model is developed from that of the parallel-plate dielectric resonator. Reflection signal is measured for the calculations of dielectric properties. The dielectric properties are computed from the resonant frequency, structure dimensions, and unloaded quality factor. The effect of the conductor loss of the metal cavity is studied. The measurement accuracy of dielectric properties is discussed by comparing the results with those measured by other well known techniques.